METHOD FOR GENERATING PREAMBLE IN MULTI-USER MULTI-INPUT MULTI-OUTPUT SYSTEM, AND DATA TRANSMISSION APPARATUS AND USER TERMINAL USING THE METHOD

• US 20110170627A1
• Filed: 01/12/2011
• Published: 07/14/2011
• Est. Priority Date: 01/12/2010
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Young Soo, Kwon, Ui Kun
• Application Number:
  US13/005,056
• Publication Number:
  US 20110170627A1
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/08 Amplitude regulation arrangements
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Provided are a method for generating a preamble included in a frame of a Multi-User Multi-Input Multi-Output (MU-MIMO) system, and a data transmission apparatus and terminal in which the method is adopted. The data transmission apparatus may enable at least one Very High Throughput-Long Training Field (VHT-LTF) sequence to be included in at least one Space Time Stream (STS) transmitted to at least one terminal, and transmits the at least one VHT-LTF sequence. The at least one VHT-LTF sequence may have the same length as another VHT-LTF sequence simultaneously transmitted.

Claims

1. A data transmission apparatus, which enables at least one Very High Throughput-Long Training Field (VHT-LTF) sequence to be included in at least one Space Time Stream (STS) transmitted to at least one terminal, and transmits the at least one VHT-LTF sequence, the at least one VHT-LTF sequence having a same length as another VHT-LTF sequence simultaneously transmitted.

2. The data transmission apparatus of claim 1, wherein the at least one VHT-LTF sequence is configured using a same orthogonal matrix with respect to the at least one terminal.

3. The data transmission apparatus of claim 1, wherein the at least one VHT-LTF sequence is generated using an orthogonal matrix satisfying a predetermined condition, and a number of rows of the orthogonal matrix and/or a number of columns of the orthogonal matrix is the same as a number of the at least one STS transmitted to each of the at least one terminal.

4. The data transmission apparatus of claim 2, wherein rows of the orthogonal matrix and/or columns of the orthogonal matrix are created in a predetermined order.

5. The data transmission apparatus of claim 1, wherein the at least one VHT-LTF sequence is generated using an orthogonal matrix satisfying a predetermined condition, and the at least one VHT-LTF sequence is generated using rows of the orthogonal matrix and/or columns of the orthogonal matrix.

6. The data transmission apparatus of claim 1, wherein the at least one STS further includes a VHT-signal (VHT-SIG) field classified for each of the at least one terminal, and the VHT-SIG field is precoded in a Space Division Multiple Access (SDMA) method.

7. The data transmission apparatus of claim 6, wherein the VHT-SIG field includes length information of a data field included in the at least one STS transmitted to the at least one terminal.

8. The data transmission apparatus of claim 1, wherein the at least one STS further includes frame padding to adjust a basic transmission unit of a data field.

9. The data transmission apparatus of claim 1, wherein the at least one STS further includes a VHT-SIG field to be common to the at least one terminal, and the VHT-SIG field includes length information of the VHT-LTF sequence.

10. The data transmission apparatus of claim 1, wherein the at least one STS further includes a Legacy signal (L-SIG) field to be common to the at least one terminal, and the L-SIG field includes length information of a frame subsequent to the L-SIG field.

11. A method of communication used by a transmitter and terminals, the method comprising:

generating one or more streams for each of the terminals, each stream including Very High Throughput-Long Training Fields (VHT-LTFs) and a data field, at least one of the one or more streams for each of the terminals including a Very High Throughput-Signal (VHT-SIG) field having length information of the data field; and

transmitting to each of the terminals the one or more streams for each of the terminals.

12. The method of claim 11, wherein a length of the VHT-LTFs in each stream is the same.

13. The method of claim 11, wherein the VHT-LTFs, the VHT-SIG, and the data field are precoded using a Space Division Multiple Access Method.

14. A method of communication used by a terminal in a multi-user multi-input multi-output system, the method comprising:

receiving one or more streams from a transmitter, each stream including Very High Throughput-Long Training Fields (VHT-LTFs) and a precoded data field, at least one of the one or more streams including a Very High Throughput-Signal (VHT-SIG) field having length information of the data field; and

decoding the precoded data field of each stream using the VHT-LTFs and the VHT-SIG.

15. The method of claim 14, wherein a length of the VHT-LTFs in each stream is the same.

16. The method of claim 14, wherein the VHT-LTFs and the VHT-SIG are precoded.

17. A data transmission apparatus, comprising:

a generation unit to generate at least one Very High Throughput-Long Training Field (VHT-LTF) sequence to be included in at least one Space Time Stream (STS) transmitted to at least one terminal; and

a transmission unit to simultaneously transmit the at least one STS in a plurality of STSs;

wherein the at least one VHT-LTF sequence has a same length as another VHT-LTF sequence included in another STS of the transmitted plurality of STSs.

18. The data transmission apparatus of claim 17, wherein the at least one STS further includes frame padding to adjust the length of the at least one VHT-LTF sequence.

19. A method of communicating between a transmitter and a plurality of terminals, the method comprising:

generating, at the transmitter, one or more streams to be transmitted to each of the respective terminals;

wherein each stream includes a same length of Very High Throughput-Long Training Fields (VHT-LTFs).

20. The method of claim 19, wherein the VHT-LTFs are precoded using the Space Division Multiple Access Method.